Winners of PMQ16 and PMQ17

My apologies for being a little lax with these announcements. I'm often waiting for replies and then it slips down the list of things to do. My excuse is that sometimes the questions take a long time to compose! This weekend, I shall be resending emails and hopefully come right up to date.

One thing to remind everyone who has sent in a PMQ answer. You will immediately receive an automated reply; this is done so that you know that your email has been received and not to send another one! Also, when you see this, please add the domain to your white list so that the prize winners announcement doesn't get caught in whatever spam trap you may have.

OK, without any further rambling...

PMQ16 Winners

Jeffrey Bond from the USA
M.K.

These were the only two entries that had at least one of the questions correct. If you wish to try the question, then just go to PMQ16 - but be careful as the answers are in the comments section!

PMQ17 Winners

Chris Breederveld from The Netherlands
Tan Qi Huan from Malaysia

You can try the question at PMQ17. Be careful, the most common mistake in this puzzle was to forget that there is an even prime!

Congratulations to all the winners and thanks to everyone who participated.

If any of the above winners wishes to add a link to their personal page such as G+ or Facebook, then please get in touch or send me a PM within G+. Thanks.